aFe Power Race Twisted Steel Down-Pipe for 15-18 BMW M3 / M4 S55

Product Description

Constructed of 3" mandrel-bent, 304 stainless steel tubing
Retains Factory O2 Sensor Locations
100% TIG-Welded
Thick flanges to ensure a leak-free seal
Race-inspired raw power with an aggressive sound
Includes high quality, O.E. style, V-band turbo flanges
In testing, this system resulted in gains up to +20 horsepower and +22 lbs. x ft. of torque (Tested on a 2015 BMW M4 (F82) L6-3.0L (tt) S55)